Rich, You are allowed to delete sprinklers from concealed spaces filled with non-combustible insulation. I'd bet this has to do with oxygen. You can also use non or limited combustible insulation (batts and panels) firmly attached to a ceiling to effectively lower that ceiling. When you put cpvc in an SFD or apartment the tenting of the pipe effectively places it within the thermal envelope of the structure rather than without but the area the pipe occupies is not required to be sprinklered anyways. So we're using insulation as a means of turning a hollow space into a solid space, we're using it as a sort of fire barrier or heat banking surface, and we're using it as a (low level) thermal barrier or insulator. I've never heard of it used to separate one fire area from another though. And horizontally! A twisting of the real allowances offered in the code may produce some logic path that suggests this application is OK. And it may even be occurring regularly (bad ideas as well as good tend to find voice simultaneously in many minds and tend to grow exponentially), but this doesn't mean it is a good idea, nor it does it sound like an appropriate application of the provisions. In fact it just sounds wrong and I think easier to argue against than for. I'm guessing a submittal is what prompted your question.
On Fri, Jun 12, 2009 at 6:26 AM, R Richardson<[email protected]> wrote: > The installation guide for CPVC is quite clear that the pipe shall not be > installed in combustible concealed spaces requiring sprinkler protection > unless the protection in the space is provided by one of the specially listed > heads for such an application. Simple enough. > > However if one is sprinklering the concealed space with standard heads > instead of the special listed heads it is not real clear what the required > separation is to consider the pipe "not" in the concealed space. Sure there > are criteria for a concealed installation, but that is specific to separation > from the room below that is being sprinklered. > > In the experience of the forum members is it normal to use insulation tented > over the pipe in as a method of treating the pipe as "not" in the concealed > space, eventhough the pipe is still kind of in the concealed space? Or is > the norm to use the concealed installation criteria eventhough that seems > specific to separation from the room below that is being sprinklered. > > This question is not related to freeze protection concerns. > > Thanks, > > Rich Richardson > Seattle Fire Department > > > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > -- Ron Greenman at home.... _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
